The revelations come amid ongoing scandal around Fillon's wife Penelope. According to media reports, she had been fictionally employed for eight years as her husband's parliamentary assistant and later as a contributor to the popular cultural magazine Revue des Deux Mondes, owned by one of Fillon's friends.
Le Canard Enchaine said Tuesday that Penelope Fillon had earned 900,000 euro as a parliamentary assistant and contributor to the Revue des Deux Mondes, raising previous estimates it made last week by 300,000 euro.
France's financial prosecutor's office had opened an investigation into Fillon's wife alleged fake employment with the National Assembly offices being searched on Tuesday as part of the probe.
Fillon, who is now the second popular candidate for the upcoming French presidential election after far-right Marine Le Pen, has four sons and one daughter.
During last days, Fillon has many times reaffirmed his commitment to his wife and his willingness to fight against the accusations.
More than 70 percent of French voters said were not convinced by The Republicans’ candidate arguments against allegations, according to the Elabe poll conducted for the BFMTV television channel and published on Tuesday.